參照http://tool.chinaz.com/Tools/Unicode.aspx，用C#做一個編碼轉換的小工具。程式碼如下：

    /// <summary>
    /// 編碼轉換工具
    /// 作者：Sunny906
    /// 日期：2014-09-15
    /// </summary>
    public partial class TransformFrm : Form
    {
        public TransformFrm()
        {
            InitializeComponent();
        }

        //定義轉換的列舉型別
        private enum TransType
        {
            ASCIIToUnicode,
            UnicodeToASCII,
            UnicodeToCN,
            CNToUnicode,
            Clear
        }

        /// <summary>
        /// 檢查輸入的內容是否為空
        /// </summary>
        /// <returns></returns>
        private bool CheckSource()
        {
            if (this.rtbSource.Text.Length == 0)
            {
                return false;
            }
            return true;
        }

        /// <summary>
        /// 根據指定的轉換型別轉換字串
        /// </summary>
        /// <param name="type">轉換型別</param>
        private void TransText(TransType type)
        {
            if (type != TransType.Clear)
            {
                if (!CheckSource())
                {
                    return;
                }
            }
            string source = this.rtbSource.Text;
            string dest = string.Empty;
            switch (type)
            {
                case TransType.ASCIIToUnicode:
                    dest = string.Empty;
                    for (int i = 0; i < source.Length; i++)
                    {
                        dest += "&#" + ((int)source[i]).ToString() + ";";
                    }
                    break;
                case TransType.UnicodeToASCII:
                    dest = string.Empty;
                    MatchCollection mc = Regex.Matches(source, "\\w+");
                    foreach (Match m in mc)
                    {
                        dest += ((char)int.Parse(m.Value)).ToString();
                    }
                    break;
                case TransType.UnicodeToCN:
                    dest = string.Empty;
                    string[] arr = source.Replace("\\", "").Split('u');
                    for (int i = 1; i < arr.Length; i++)
                    {
                        dest += (char)int.Parse(arr[i], NumberStyles.HexNumber);
                    }
                    break;
                case TransType.CNToUnicode:
                    dest = string.Empty;
                    for (int i = 0; i < source.Length; i++)
                    {
                        dest += "\\u" + ((int)source[i]).ToString("x");
                    }
                    break;
                case TransType.Clear:
                    this.rtbDest.Clear();
                    break;
            }
            this.rtbDest.Text = dest;
        }

        private void btnASCIIToUnicode_Click(object sender, EventArgs e)
        {
            TransText(TransType.ASCIIToUnicode);
        }

        private void btnUnicodeToASCII_Click(object sender, EventArgs e)
        {
            TransText(TransType.UnicodeToASCII);
        }

        private void btnUnicodeToCN_Click(object sender, EventArgs e)
        {
            TransText(TransType.UnicodeToCN);
        }

        private void btnCNToUnicode_Click(object sender, EventArgs e)
        {
            TransText(TransType.CNToUnicode);
        }

        private void btnClear_Click(object sender, EventArgs e)
        {
            TransText(TransType.Clear);
        }
    }